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Statistical analysis of Hasegawa - Wakatani turbulence

Johan Anderson (Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi) ; Bogdan Hnat
Physics of Plasmas (1070-664X). Vol. 24 (2017), 6, p. 062301.
[Artikel, refereegranskad vetenskaplig]

Resistive drift wave turbulence is a multipurpose paradigm that can be used to understand transport at the edge of fusion devices. The Hasegawa-Wakatani model captures the essential physics of drift turbulence while retaining the simplicity needed to gain a qualitative understanding of this process. We provide a theoretical interpretation of numerically generated probability density functions (PDFs) of intermittent events in Hasegawa-Wakatani turbulence with enforced equipartition of energy in large scale zonal flows and small scale drift turbulence. We find that for a wide range of adiabatic index values the stochastic component representing the small scale turbulent eddies of the flow, obtained from the ARIMA model, exhibits super-diffusive statistics, consistent with intermittent transport. The PDFs of large events (above one standard deviation) are well approximated by the Laplace distribution, while small events often exhibit a Gaussian character. Furthermore there exist a strong influence of zonal flows for example, via shearing and then viscous dissipation maintaining a sub-diffusive character of the fluxes.

Nyckelord: Resistive drift waves, Statitsical analysis, ARIMA



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Denna post skapades 2017-06-08. Senast ändrad 2017-08-15.
CPL Pubid: 249632

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi (2013-2017)

Ämnesområden

Energi
Plasmafysik
Fusion

Chalmers infrastruktur